こんにちは。愛媛大学の藤田です。
次回のTGSAセミナーの案内を転送します。
藤田 博司 [email protected]
________________________________ 差出人: Dmitri SHAKHMATOV [email protected] 送信日時: 2017年4月11日 10:55 宛先: FUJITA Hiroshi CC: [email protected] 件名: 松山 TGSAセミナーのお知らせ(4月19日)
皆様、
「Matsuyama Seminar on Topology, Geometry, Set Theory and their Applications」(松山TGSAセミナー)のお知らせです。
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第30回のセミナー
日時: 2017年4月19日(水) 16:30〜17:30
場所: 愛媛大学理学部2号館2階,大演習室 (201号室)
講演者: Alejandro Dorantes-Aldama (愛媛大学)
題目: Selective sequential pseudcompactness
概要: We say that a topological space $X$ is {\em selectively sequentially pseudcompact} if for every family ${U_n:n\in\mathbb{N}}$ of non-empty open subsets of $X$, one can choose a point $x_n\in U_n$ for each $n\in\mathbb{N}$ in such a way that the sequence ${x_n:n\in \mathbb{N}}$ has a convergent subsequence. We show that the class of selectively sequentially pseudcompact spaces is closed under arbitrary products and continuous images, contains the class of all dyadic spaces and forms a proper subclass of the class of strongly pseudocompact spaces introduced recently by Garc'ia-Ferreira and Ortiz-Castillo. We prove, under the Singular Cardinal Hypothesis SCH, that if $G$ is an Abelian group admitting a pseudocompact group topology, then it can also be equipped with a selectively sequentially pseudcompact group topology. Since selectively sequentially pseudcompact spaces are strongly pseudocompact, this provides a strong positive answer to a question of Garc'ia-Ferreira and Tomita. This is a joint work with Dmitri Shakhmatov.
講演終了後に交流会を予定しています。交流会にご参加いただける方はシャクマトフ[email protected]までご一報お願い致します。
以上、よろしくお願い申し上げます。
世話人(五十音順) 井上友喜 尾國新一 シャクマトフ ディミトリ 野倉嗣紀 平出耕一 平田浩一 藤田博司 山内貴光
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